Like above, looks natural, they will tend to bend about a bit as they try to position themselves to get the best light. I've seen fan leaves do a full 180⁰ flip after training, and had some who grew almost vertical rather than flat. If it's anything else it could be a trauma from a growth spurt, like tearing a muscle, and it just kinked ever so slightly. Wouldn't think it's anything to worry about, looks nice and healthy otherwise.